Dear Mr. Gray.
Thank you for posting your request on History Hub!
We suggest that you begin by contacting the Archivo Nacional de Panamá.
The United States also has some records captured during Operation Just Cause in 1989. These records are not in the custody of the National Archives. They may be in the custody of the Defense Logistics Agency. The Agency Records Management Officer for the DLA is Ms. Cecilia Wiker, Defense Logistics Agency, 74 Washington Avenue N, Battle Creek, MI 49037. Her email address is firstname.lastname@example.org and telephone number is 269-961-4846.
We hope this information is helpful. Best of luck with your research!